People have been going on about the shortcomings of exposed chains ever since I started biking back when dinosaurs roamed the land. In the letters pages of ancient mags like Motorcycle Sport every month there would usually be someone bleating about how their BSA or something wore out a chain in 500 miles and why can't manufacturers enclose them. 50 yrs on nothing has changed except chains have become a bit more hi-tech.
Instead of enclosure all sorts of aftermarket lash ups like chain oilers have appeared and appear to be commercially successful. The occasional attempts to produce an aftermarket chaincase have all sunk without trace though (Peter Furlong anyone?). I can understand why; with the possible exception of MZ's efforts they all look as ugly as sin. A pity in some respects as they do work - my 1976 Suzuki has one and it's still running on the hardly worn original chain. OK, it's only a 125 but the chain is hardly any bigger than those fitted to bicycles and back it in the winter it survived 2000 miles of salt laden autobahn without needing oiling or adjusting.
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